ADSM-L

Re: Question about LanFreeBackup

2006-10-16 15:15:56
Subject: Re: Question about LanFreeBackup
From: Francisco Molero <fmolero AT YAHOO DOT COM>
To: ADSM-L AT VM.MARIST DOT EDU
Date: Mon, 16 Oct 2006 12:07:48 -0700
>From performance and tunning guide:

262144

----- Mensaje original ----
De: Robert Ouzen Ouzen <rouzen AT UNIV.HAIFA.AC DOT IL>
Para: ADSM-L AT VM.MARIST DOT EDU
Enviado: lunes, 16 de octubre, 2006 20:39:38
Asunto: Re: Question about LanFreeBackup

Fran



What is your suggestion of the size for the buffpoolsize parameter on a 2 GB 
memory server and LTO2 TAPES



Regards



Robert Ouzen 



-----Original Message-----

From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of 
Francisco Molero

Sent: Monday, October 16, 2006 8:28 PM

To: ADSM-L AT VM.MARIST DOT EDU

Subject: Re: [ADSM-L] Question about LanFreeBackup



In my opinion, you can get great performance with LTO3 and aplications like 
db2, Oracle, SAP, Domino, Exchange, etc. It is a good idea if you want to 
backup big files. I don't recommend you if you want to backup fileservers. 



I have found differents performance. The best one was 1,5 TB y 1:30 minutes 
using LTO3 and DS8100, SAP with Oracle and AIX. 



The best parameters in TSM 5.3 are the defaults, Only you have to change the 
buffpoolsize in the server. The best communication method in TSM 5.3 is 
sharedmem. 



I hope this help you. 





Regards,



    Fran



TSM deployment certified.

TSM administrator certified.

ITIL Certified.

AIX Certified. 



----- Mensaje original ----

De: Mark Stapleton <margek.s AT EVOLVINGSOL DOT COM>

Para: ADSM-L AT VM.MARIST DOT EDU

Enviado: lunes, 16 de octubre, 2006 20:01:51

Asunto: Re: Question about LanFreeBackup



From: ADSM: Dist Stor Manager [mailto:ADSM-L AT VM.MARIST DOT EDU] On Behalf Of 
Anker Lerret

>> Remember that LAN-free backups are often no faster than 100MB/1GB 

>> Ethernet LAN-based backups. (In a few cases they will actually be 

>> slower.)

>

>Mark, can you say some more about that?  We're hoping to start doing 

>LAN-free and I was hoping that we could see some nice improvements in 

>large backups that go straight to tape.  Are you just talking about the 

>case where the LAN is relatively uncongested and the SAN is overloaded?

>Or is there something else I'm missing?



I can't say that I've got quantifiable data; I speak from real-world 
experience. SAN-based data transfer from disk to tape has been, in the best of 
situations, only slightly faster than similar LAN-based data transfer. As I 
said earlier, the only advantages I've ever seen to LAN-free backups have been 
1. where the LAN is too congested (or poorly configured) to guantee reasonable 
backup speeds 2. the disk storage pool is too small to handle large file 
backups.

3. you want to guarantee that an entire node's backups go directly to tape



--

Mark Stapleton (mark.s AT evolvingsol DOT com)

Senior TSM engineer











        

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LLama Gratis a cualquier PC del Mundo. 
Llamadas a fijos y móviles desde 1 céntimo por minuto. 
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